meson: check for reallocarray

it is needed for the new cache code

configure.ac

@@ -22,7 +22,7 @@ AX_CHECK_COMPILE_FLAG([-std=gnu99], [CFLAGS="$CFLAGS -std=gnu99"], [
 	AX_CHECK_COMPILE_FLAG([-std=c99], [CFLAGS="$CFLAGS -std=c99"])
 ])
 AC_CONFIG_HEADERS([libpkgconf/config.h])
-AC_CHECK_FUNCS([strlcpy strlcat strndup])
+AC_CHECK_FUNCS([strlcpy strlcat strndup reallocarray])
 AC_CHECK_HEADERS([sys/stat.h])
 AM_INIT_AUTOMAKE([foreign dist-xz subdir-objects])
 AM_SILENT_RULES([yes])

libpkgconf/config.h.meson

@@ -9,6 +9,9 @@
 /* Define to 1 if you have the `strndup' function. */
 #mesondefine HAVE_STRNDUP
 
+/* Define to 1 if you have the `reallocarray' function. */
+#mesondefine HAVE_REALLOCARRAY
+
 /* Name of package */
 #mesondefine PACKAGE
 

meson.build

@@ -16,6 +16,7 @@ check_functions = [
   ['HAVE_STRDUP', 'strdup', 'string.h'],
   ['HAVE_STRNCASECMP', 'strncasecmp', 'strings.h'],
   ['HAVE_STRCASECMP', 'strcasecmp', 'strings.h'],
+  ['HAVE_REALLOCARRAY', 'reallocarray', 'stdlib.h'],
 ]
 
 foreach f : check_functions